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. 2021 Apr 21;4:489. doi: 10.1038/s42003-021-02025-0

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — a Map of Italy showing the number of SARS-CoV-2 genome sequences by region. The size of the circles indicates the number of new genomes available since the beginning of the epidemic in Italy. b Time-resolved maximum likelihood tree of 1421 SARS-CoV-2 sequences including 714 from Italy (red circles). c Chord diagram of estimated numbers of migration flows between the geographic areas. d Frequency of estimated geographical origins for identified transmission clusters involving Italy and originating in the months of January through October of 2020. e Frequency of Italian sequences (sampled from January through October) classified as unclustered (gray) or belonging to clusters with Italian (white) or non-Italian origins (black).